--- a/test/jdk/java/util/NavigableMap/LockStep.java	Tue Jan 16 18:24:32 2018 -0800
+++ b/test/jdk/java/util/NavigableMap/LockStep.java	Tue Jan 16 18:28:39 2018 -0800
@@ -32,10 +32,35 @@
  * @key randomness
  */
 
-import java.io.*;
-import java.util.*;
-import java.util.concurrent.*;
-import static java.util.Collections.*;
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.NotSerializableException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.io.Serializable;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Map;
+import java.util.NavigableMap;
+import java.util.NavigableSet;
+import java.util.NoSuchElementException;
+import java.util.Random;
+import java.util.Set;
+import java.util.TreeMap;
+import java.util.TreeSet;
+import java.util.concurrent.ConcurrentSkipListMap;
+import java.util.concurrent.ConcurrentSkipListSet;
+
+import static java.util.Collections.reverseOrder;
+import static java.util.Collections.singleton;
+import static java.util.Collections.singletonMap;
 
 @SuppressWarnings("unchecked")
 public class LockStep {